Journal of a voyage in Baffin's Bay and Barrow Straits, in the years 1850-1851 : performed by H.M. ships "Lady Franklin" and "Sophia," under the command of Mr. William Penny, in search of the missing crews of H.M. ships Erebus and Terror : with a narrative of sledge excursions on the ice of Wellington Channel : and observations of the natural history and physical features of the countries and frozen seas visited.